import Vue from "vue";
import { on } from "../utils/util";

const nodeList = [],
  ctx = "@@clickoutsideContext";
let startClick,seed = 0;
if(!Vue.prototype.$isServer){
  on(document, "mousedown", (e) => (startClick = e));
  on(document, "mouseup", (e) => nodeList.forEach(node => node[ctx].documentHandler(e, startClick)));
}
function createDocumentHandler(el, binding, vnode) {
  return function (mouseup = {}, mousedown = {}) {
    if (!vnode || !vnode.context || !mouseup.target || !mousedown.target || el.contains(mouseup.target) || el.contains(mousedown.target) || el === mouseup.target ||
      (vnode.context.popperElm &&
        (vnode.context.popperElm.contains(mouseup.target) ||
          vnode.context.popperElm.contains(mousedown.target)))
    ){
      return;
    }
    if (
      binding.expression &&
      el[ctx].methodName &&
      vnode.context[el[ctx].methodName]
    ) {
      vnode.context[el[ctx].methodName]();
    } else {
      el[ctx].bindingFn && el[ctx].bindingFn();
    }
  };
}
export default {
  bind(el, binding, vnode) {
    nodeList.push(el);
    const id = seed++;
    el[ctx] = {
      id,
      documentHandler: createDocumentHandler(el, binding, vnode),
      methodName: binding.expression,
      bindingFn: binding.value,
    };
  },
  update(el, binding, vnode) {
    el[ctx].documentHandler = createDocumentHandler(el, binding, vnode);
    el[ctx].methodName = binding.expression;
    el[ctx].bindingFn = binding.value;
  },
  unbind(el) {
    let len = nodeList.length;
    for (let i = 0; i < len; i++) {
      if (nodeList[i][ctx].id === el[ctx].id) {
        nodeList.splice(i, 1);
        break;
      }
    }
    delete el[ctx];
  },
};
